FBI to brief House members on alleged Russian hacking of Florida county

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Voting booths set up inside a polling station in Christmas, Florida on November 8, 2016.

(CNN)The FBI will brief Florida members of Congress next week about the claim that a Florida county was hacked by Russian intelligence in 2016, two sources familiar with the plan told CNN.

Previous reporting and government announcements have established that the GRU, Russian military intelligence, created an email phishing campaign aimed at Florida county election employees in the summer preceding the 2016 presidential election. But it wasn't until special counsel Robert Mueller's report was published that the public learned the FBI had investigated a particular county for actually being hacked.

"[T]he FBI believes that this operation enabled the GRU to gain access to the network of at least one Florida county government," the report claims.

The briefing will take place on May 16. The news was first reported by Politico.

During Russia's multi-pronged election interference campaign of 2016 the GRU targeted VR Systems, an electronic pollbook manufacturer that a number of Florida counties use to maintain their voter registration databases. The GRU hackers then sent out phishing emails from Gmail accounts with VR Systems in its name, and with a malicious file attached to more than 120 county election officials.

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Many of those emails were ignored, went to spam, or were properly flagged as a potential attack. The special counsel's claim was the first public indication that someone fell for them.

Multiple government officials have repeatedly insisted that there is no evidence hackers changed any votes in either the 2016 or 2018 election, but have stopped short of claiming that hackers were never in a position to make it more difficult for people to vote.

The briefing is in response to a request that House Representatives Stephanie Murphy, Democrat of Florida, and Michael Waltz, Republican of Florida, made in a letter to Attorney General William Barr and FBI Director Christopher Wray on May 2.

Florida's governor and secretary of state have also said that they were unfamiliar with the 2016 hack, and have requested answers. Gov. Ron DeSantis has also requested an FBI briefing on the subject, but does not have a date set, though his office says it wants it to take place before DeSantis visits Israel on May 25.